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Php or mysql problem??

the main problem is when a user uploads a photo to my site, the script converts the file name to something like 863d56ec9a75c15fbad89e8c046f43e1.jpg, and storing this file name to mysql database, and everything was doing fine.
but now when i try to upload a pic, after uploading the pic is not appearing coz the entry now in database is like http://www.sitename.com/memphoto2//5...2feb7d739adjpg
(note extra things like site link, foldername, double back slash, and no dot before jpg in the last)

my hosting provider told me that they re-installed or upgraded GD Library (and may be something else) on server 2-3 days back.

and i havnt change any code or anything in site from 15 days
so what do u think where the problem is???????